With the emergence of large-screen and intelligent cell phones, which used to be a tool for communication, now it has become a tool for entertainment. So, everywhere you can see those who use cell phones to play games, microblogging, WeChat, QQ, watch videos. Many people are used to this to pass the time, so we always see this scene: one hand holding the phone, the other hand constantly touch the screen, and some even walk without slowing down. What is the harm to the eyes? How can I enjoy the fun of watching, but also to reduce the damage to the eyes to a minimum? 1, adjust the brightness of the phone screen. Try not to adjust the brightness of the phone too low and too bright, the light to not harsh and do not bother to be able to see as appropriate, too bright and too dark screen will make eye fatigue. 2, when watching the phone at night many people feel that the computer or TV screen originally had brightness, you can turn off the lights. In fact, look at the bright screen in a dark environment, but because the contrast in brightness is too great, causing eye discomfort. Therefore, it is best to have diffuse soft light around the screen, do not turn off the lights to look at the phone. 3, font size is very important, no matter what age group of people font must not be adjusted to small, for children and adolescents, although small fonts can also see very clearly, but small fonts are more likely to lead to the formation and development of myopia; for more than forty years old, the font is also appropriate to adjust slightly larger, so that the eyes are not more easily fatigued, look at the time will also be longer. 4, do not look at the phone in the sunlight, especially under the hot summer sun, too much external light will make the screen on the phone more difficult to see. 5, play cell phones to have moderation, pay attention to control the time to look at the phone, play an hour in a row must be appropriate to let the eyes look away for a while, let the eyes rest. 6, try to turn the browser to night mode to browse the web at night. 7, if in bed, it is best to sit against the head of the bed to play cell phones. Playing with your cell phone before bedtime has less impact on your health than sitting down to play. This will be more comfortable for every part of the body, but also easy to control the distance of the phone from the eyes, the distance of the phone from the eyes to 33cm to 40cm is appropriate. 8, do not lie on the side of the body to look at the phone. Lying on the side has the greatest pressure on the eyes, which will cause deviations in vision of the left and right eyes. In addition, the pressure of the pillow on the eyes will cause insufficient blood supply, the eyes will be swollen over time, prone to short-time image overlap. 9, do not play the phone prone. Keep the prone position to play cell phones, will affect the elbow, cerebral blood circulation, and may cause inert ischemia above the crista. In addition, the prone position is prone to induce fatigue, it is difficult to enter the sleep state. 10, in addition to the well-known cell phone “radiation” problem, the impact on the eye is mainly from the cell phone screen blue light brought about, how to resist it? Protecting the health of the eyes has become a concern for cell phone people.